Prod. # 8001, 1/4″ 316 SS BSS Style Basic-Check® Threaded In-Line Check Valve

Description

The DFT® Basic-Check valve is a versatile all-purpose, spring-assisted, in-line check valve that provides reliable, low maintenance service for a wide range of liquids and gases at various pressure/temperature combinations. The valve consists of a guard cage, spring, valve disc, retaining ring and seat. It can be combined with pipe fittings such as reducing couplings, drain elbows, etc. to form a complete check valve unit ideally suited for a broad range of pipeline applications or incorporated into machinery for OEM applications. The metal-to-metal sealing area of the Basic-Check valve’s disc and seat is precision lapped, providing very tight shut-off of both gas and liquid. If bubble-tight shut-off is required, resilient soft seats are available.

Light spring available: Cracking Pressure = 0.24 PSI (6.5 inches of water)

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    Specifications
    Series

    Basic-Check®

    Size

    DN 8
    0.25 in

    Line Size Inlet (FNPT) A

    0.25 in

    Style

    BSS

    Outside Thread (MNPT) B

    1.00 in

    Cv

    5.8

    Friction Loss (Feet of Pipe)

    7

    Friction Loss (Meter of Pipe)

    2.1

    Valve Cracking Pressure1

    0.60 psi
    0.041 bar
    16.7 in.water
    424 mm.water
    31.1 mmHg

    Valve Cracking Pressure Tolerance

    ±10%

    Approx. Net Weight Each

    0.38 lb
    0.2 kg

    Cold Working Pressure2

    0 psig
    2500 psig
    0 barg
    172 barg

    1 Cracking pressure for vertical flow will be slightly different: upward flow, slightly higher; downward flow, slightly less.
    Not recommended for use on discharge of reciprocating compressors.
    2 Contingent on service ratings of matching pipe and fittings.

    Materials of Construction
    Seat

    303 SS

    Disc

    316 SS

    Guard

    303 SS

    Spring

    316 SS

    Retaining Ring

    316 SS

    Soft Seat Materials
    Soft Seat Materials1

    Buna-N -49 (-70 to 250°F)
    EPDM -57 (-75 to 300°F)
    TFE®-Viton -98 (-40 to 400°F)
    Viton® -51 (-40 to 400°F)
    Zelon® -54 (37 to 400°F)

    1 Soft seats are not available for the Style BSE check Valve. Buna-N and Viton are not suitable for steam service.

    Springs
    Springs

    Inconel® X-750 (-460 to 700°F)
    316 SS (-460 to 450°F)

    Valve Selection Specifications
    ENDS

    NPT

    ASME

    2500 CWP

    Materials

    303 SS

    Codes and Standards
    ANSI

    B1.20.1

    MSS

    SP-25

    Features
    • 1/4″ to 2 1/2″ Line size
    • 450 to 6000 CWP
    • Threaded ends
    • Stainless Steel Construction
    • Spring-assisted silent closing
    • Horizontal or vertical installation
    • Tight shut-off – lapped disc & seat
    • Easy Maintenance
    • Versatile
    Options
    • Inconel® 750 Spring
    • Soft seat